C语言 如何在c中读取二进制文件？（视频、图像或文本）
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How to read a binary file in c? (video, images, or text)
提问by Collin Price
I am trying to copy a file from a specified library to the current directory. I can copy text files perfectly. Any other files become corrupt. The program detects a feof before it should.
我正在尝试将文件从指定的库复制到当前目录。我可以完美地复制文本文件。任何其他文件都会损坏。该程序在它应该之前检测到feof。
#include <stdio.h>
int BUFFER_SIZE = 1024;
FILE *source;
FILE *destination;
int n;
int count = 0;
int written = 0;
int main() {
unsigned char buffer[BUFFER_SIZE];
source = fopen("./library/rfc1350.txt", "r");
if (source) {
destination = fopen("rfc1350.txt", "w");
while (!feof(source)) {
n = fread(buffer, 1, BUFFER_SIZE, source);
count += n;
printf("n = %d\n", n);
fwrite(buffer, 1, n, destination);
}
printf("%d bytes read from library.\n", count);
} else {
printf("fail\n");
}
fclose(source);
fclose(destination);
return 0;
}
回答by Hans W
Are you on a Windows machine? Try adding "b" to the mode strings in the calls to fopen.
你在 Windows 机器上吗？尝试将“b”添加到调用中的模式字符串fopen。
From man fopen(3):
来自 man fopen(3)：
The mode string can also include the letter 'b' either as a last character or as a character between the characters in any of the two-character strings described above. This is strictly for compatibility with C89 and has no effect; the 'b' is ignored on all POSIX conforming systems, including Linux. (Other systems may treat text files and binary files differently, and adding the 'b' may be a good idea if you do I/O to a binary file and expect that your program may be ported to non-Unix environments.)
模式字符串还可以包括字母“b”作为最后一个字符或作为上述任何两个字符串中的字符之间的字符。这严格是为了兼容 C89，没有任何影响；'b' 在所有符合 POSIX 的系统上都被忽略，包括 Linux。（其他系统可能会以不同的方式对待文本文件和二进制文件，如果您对二进制文件进行 I/O 操作并希望您的程序可以移植到非 Unix 环境，那么添加 'b' 可能是个好主意。）
回答by Thomas
You need to specify the "b"option to fopen:
您需要将"b"选项指定为fopen：
source = fopen("./library/rfc1350.txt", "rb");
...
destination = fopen("rfc1350.txt", "wb");
Without it, the file is opened in text ("t") mode, and this results in translation of end-of-line characters.
如果没有它，文件将以文本 ( "t") 模式打开，这将导致行尾字符的翻译。
回答by user200783
You need to open the files in binary format rather than text format. In your calls to fopen, use "rb"and "wb"rather than "r"and "w"respectively.
您需要以二进制格式而不是文本格式打开文件。在您对 的调用中fopen，分别使用"rb"and"wb"而不是"r"and "w"。
